Jumpy exported animation


When I make an animation of Plot3D using ListAnimate it looks decent. But when I export the same frames with Export, the z-axis tick labels jump back and forth. Here’s a minimal example:

f = Table[   Plot3D[(1 + Sin[2 \[Pi] t]) E^(-(x - Sin[2 \[Pi] t])^2 - (y - Cos[2 \[Pi] t])^2),     {x, -2, 2}, {y, -2, 2}, PlotLabel -> t, PlotRange -> All, ViewPoint -> {-2, -2, 1}] , {t, 0, 0.95, 0.05}];  ListAnimate[f] (* looks OK *)  Export["f.gif", f, "AnimationRepetitions" -> \[Infinity]] (* looks bad *) 

enter image description here

Any idea how I can get Export to behave like ListAnimate?